### Please describe the problem.

The file extension of annexed files are dropped if they have more than four characters (like `.blend` files)
All `*E` backends are affected but `WORM` seems to work.

### What steps will reproduce the problem?

[[!format sh """
mkdir foo && cd foo
git init
git annex init
echo '* annex.backend=SHA256E' > .gitattributes
echo '* annex.largefiles=(largerthan=0)' >> .gitattributes
echo 'foo' > foo.abc
echo 'bar' > bar.abcd
echo 'baz' > baz.abcde
echo 'faz' > faz.abcdef
git annex add .
ls -l
"""]]

Outputs

[[!format sh """
total 16
lrwxrwxrwx 1 foo bar 188 Apr 18 11:52 bar.abcd -> .git/annex/objects/z2/jk/SHA256E-s4--7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730.abcd/SHA256E-s4--7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730.abcd
lrwxrwxrwx 1 foo bar 178 Apr 18 11:52 baz.abcde -> .git/annex/objects/MZ/Fq/SHA256E-s4--bf07a7fbb825fc0aae7bf4a1177b2b31fcf8a3feeaf7092761e18c859ee52a9c/SHA256E-s4--bf07a7fbb825fc0aae7bf4a1177b2b31fcf8a3feeaf7092761e18c859ee52a9c
lrwxrwxrwx 1 foo bar 178 Apr 18 11:52 faz.abcdef -> .git/annex/objects/6Z/zG/SHA256E-s4--0206bf5fc94a74ae22c2c0e93ad1b578ae7f16cb52fb470cddf1f0d324c6bbf3/SHA256E-s4--0206bf5fc94a74ae22c2c0e93ad1b578ae7f16cb52fb470cddf1f0d324c6bbf3
lrwxrwxrwx 1 foo bar 186 Apr 18 11:52 foo.abc -> .git/annex/objects/Mq/J5/SHA256E-s4--b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c.abc/SHA256E-s4--b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c.abc
"""]]


### What version of git-annex are you using? On what operating system?

- Tested with Ubuntu 22.04
- git-annex v8 from original ubuntu ppa
- git-annex-standalone v10 from neurodebian ppa

### Please provide any additional information below.

[[!format sh """
$ git annex version
git-annex version: 10.20240227-1~ndall+1
build flags: Assistant Webapp Pairing Inotify DBus DesktopNotify TorrentParser MagicMime Benchmark Feeds Testsuite S3 WebDAV
dependency versions: aws-0.22.1 bloomfilter-2.0.1.0 cryptonite-0.29 DAV-1.3.4 feed-1.3.2.1 ghc-9.0.2 http-client-0.7.13.1 persistent-sqlite-2.13.1.0 torrent-10000.1.1 uuid-1.3.15 yesod-1.6.2.1
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2BP512E BLAKE2BP512 BLAKE2S256E BLAKE2S256 BLAKE2S160E BLAKE2S160 BLAKE2S224E BLAKE2S224 BLAKE2SP256E BLAKE2SP256 BLAKE2SP224E BLAKE2SP224 SHA1E SHA1 MD5E MD5 WORM URL X*
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs httpalso borg hook external
operating system: linux x86_64
supported repository versions: 8 9 10
upgrade supported from repository versions: 0 1 2 3 4 5 6 7 8 9 10
local repository version: 10
"""]]

> As nobodyinperson says, set annex.maxextensionlength to 5 in order to
> support such long extensions. [[done]] --[[Joey]]
